1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/* Copyright (c) 2010 James Snyder, eLua Project.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the right
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <fcntl.h>
#include <angel.h>
#include "filesystem.h"
#include "fio.h"
#include "semifs.h"
#include "osdebug.h"
struct semifs_fds_t {
uint32_t file;
uint32_t cursor;
};
static struct semifs_fds_t semifs_fds[MAX_FDS];
// These structures provided by Simon Ford of mbed
struct semifs_FTime {
uint8_t hr; // Hours [0..23]
uint8_t min; // Minutes [0..59]
uint8_t sec; // Seconds [0..59]
uint8_t day; // Day [1..31]
uint8_t mon; // Month [1..12]
uint16_t year; // Year [1980..2107]
};
// File Search info record
struct semifs_XF_Info {
char name[32]; // File - 32-bytes
uint32_t size; // File size in bytes - 4-bytes
uint16_t fileID; // System File Identification - 2-bytes
struct semifs_FTime create_time; // Date & time file was created
struct semifs_FTime write_time; // Date & time of last write
};
struct semifs_SearchInfo {
const char *pattern;
struct semifs_XF_Info file_info;
};
/*****************************************************************************/
static int semifs_close(void * opaque) {
struct semifs_fds_t * f = (struct semifs_fds_t *) opaque;
// DBGOUT("semifs_close(%p)\r\n", opaque);
return Semihost_SYS_CLOSE(&f->file);
}
static ssize_t semifs_write(void * opaque, const void * ptr, size_t len) {
struct semifs_fds_t * f = (struct semifs_fds_t *) opaque;
// DBGOUT("semifs_write(%p, %p, %i)\r\n", opaque, ptr, len);
uint32_t args[3];
args[0] = (uint32_t) f->file;
args[1] = (uint32_t) ptr;
args[2] = (uint32_t) len;
// Perform write
int res = Semihost_SYS_WRITE(args);
// DBGOUT("semifs_read: Semihost_SYS_WRITE returned %i\r\n", res);
if (res == -1 || res == len)
return -1;
// Update position
f->cursor += len - res;
return len - res;
}
static ssize_t semifs_read(void * opaque, void * ptr, size_t len) {
struct semifs_fds_t * f = (struct semifs_fds_t *) opaque;
// DBGOUT("semifs_read(%p, %p, %i)\r\n", opaque, ptr, len);
uint32_t args[3];
args[0] = (uint32_t) f->file;
args[1] = (uint32_t) ptr;
args[2] = (uint32_t) len;
// Perform read
int res = Semihost_SYS_READ(args);
DBGOUT("semifs_read: Semihost_SYS_READ returned %i\r\n", res);
if (res < 0)
return -1;
// Update position
f->cursor += len - res;
return len - res;
}
static off_t semifs_seek(void * opaque, off_t off, int whence) {
uint32_t args[2], len;
struct semifs_fds_t * f = (struct semifs_fds_t *) opaque;
// DBGOUT("semifs_seek(%p, %i, %i)\r\n", opaque, off, whence);
switch (whence) {
case SEEK_CUR:
// seek from current position
off += f->cursor;
whence = SEEK_SET;
break;
case SEEK_END:
// seek from end of file
args[0] = (uint32_t) f->file;
len = Semihost_SYS_FLEN(args);
// DBGOUT("semifs_seek: Semihost_SYS_FLEN returned %i\r\n", len);
off += len;
break;
}
// Do absolute seek
args[0] = (uint32_t) f->file;
args[1] = (uint32_t) off;
int res = Semihost_SYS_SEEK(args);
// DBGOUT("semifs_seek: Semihost_SYS_SEEK returned %i\r\n", res);
if (res == 0)
f->cursor = off;
/* This is expected to return the position in the file. */
return res == 0 ? off : -1;
}
static int semifs_open(void * opaque, const char *path, int flags, int mode) {
int aflags = 0;
unsigned int fh;
uint32_t args[3];
// DBGOUT("semifs_open(%p, \"%s\", %i, %i)\r\n");
if (flags & O_RDWR)
aflags |= 2;
if (flags & O_CREAT)
aflags |= 4;
if (flags & O_TRUNC)
aflags |= 4;
if (flags & O_APPEND) {
aflags &= ~4; // Can't ask for w AND a; means just 'a'.
aflags |= 8;
}
// Find file and open it (via semihosting call)
args[0] = (uint32_t) path;
args[1] = (uint32_t) aflags;
args[2] = (uint32_t) strlen(path);
fh = Semihost_SYS_OPEN(args);
// DBGOUT("Semihost_SYS_OPEN returns: %i\r\n", fh);
if (fh >= 0) {
int fd = fio_open(semifs_read, semifs_write, semifs_seek, semifs_close, (void *) fh);
// DBGOUT("semifs_open: fio_open returned %i\r\n", fd);
if (fd < 0)
Semihost_SYS_CLOSE((uint32_t *) &fd);
semifs_fds[fd].file = fh;
semifs_fds[fd].cursor = 0;
fio_set_opaque(fd, semifs_fds + fd);
return fd;
}
return -1;
}
void register_semifs() {
DBGOUT("Registering semihost fs\r\n");
register_fs("host", semifs_open, NULL);
}
|
